Method findCharBefore

MathParser/src/com/aghajari/math/Utils.java:84–91

(String src, int start)

    }

    public static char findCharBefore(String src, int start) {
        try {
            src = src.substring(0, start).trim();
            return src.isEmpty() ? '\0' : src.charAt(src.length() - 1);
        } catch (Exception ignore) {
            return '\0';
        }
    }

    public static char findCharAfter(String src, int start) {
        try {